CVE-2026-115825 Miyagawa CVE debrief

Who should care

Defenders responsible for Perl-based web servers, especially those using HTTP::Server::PSGI, should assess exposure and prioritize verification and potential upgrades. This includes operators, platform administrators, vulnerability management teams, and security teams who manage or monitor these systems.

Why it matters

Defenders should prioritize verifying exposure of HTTP::Server::PSGI instances and assess the feasibility of upgrading to version 1.0056 or later to prevent potential denial of service attacks.

• Potential denial of service due to server crashes
• Need for verification of exposure and potential upgrades
• Possible impact on server availability and reliability

Technical summary

The vulnerability in HTTP::Server::PSGI versions before 1.0056 for Perl allows a remote attacker to crash the server by sending a request with a large Content-Length. The server attempts to allocate as much memory as requested, leading to an out-of-memory error before the application is called. This issue affects Perl-based web servers using HTTP::Server::PSGI, particularly those running as a single process. Limited evidence suggests that the vulnerability can be exploited remotely with a single request, causing the server to exit.

Defensive priority

Defenders should prioritize verifying exposure of HTTP::Server::PSGI instances, especially those running as a single process, and assess the feasibility of upgrading to version 1.0056 or later.

Recommended defensive actions

• Verify exposure of HTTP::Server::PSGI instances, especially those running as a single process
• Assess the feasibility of upgrading to version 1.0056 or later
• Monitor server logs for out-of-memory errors caused by large Content-Length requests
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is triggered by a single request with a large Content-Length and a few body bytes, causing the server to exit with an out-of-memory error. The server stays down until restarted. This issue is specific to HTTP::Server::PSGI versions before 1.0056 for Perl. Limited evidence suggests that the vulnerability can be exploited remotely.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.